例如第一個習慣用語down and dirty中的dirty就解釋爲“不正當的, 卑鄙的”，而down在這兒的意思是下流陰險的。所以down and dirty表示的意思類似於dirty pool和shady deal, 都指正派人不屑於做的卑鄙勾當。
例句-1：This guy ran a real down and dirtycampaign; every day he started more rumors about our man’s honesty and personal life. But the voters saw he was lying so we easily beat him.
這傢伙爲了贏得競選真是不擇手段。他每天都散佈謠言中傷我們候選人的品德和私生活。好在選民看透了他在撒謊，所以我們輕而易舉就把他擊敗了。
我們要學的第二個習慣用語是: dirty crack。Crack可以解釋爲俏皮話或者幽默的玩笑, 但是前面加上dirty意思可就不同了，dirty crack是“刺傷人的`挖苦話”。
例句-2：Finally Bob made a dirty crack about the quarterback -- he called him so dumb he couldn’t add up two and two. At this the man next to him got up and hit him in the eye: it turns out the quarterback was his son.
鮑勃終於忍無可忍了，對着那名四分衛叫喊說，他笨得連二加二是多少都算不出來。他身邊那人聽了這話站起身來就朝着鮑勃的眼睛打了一拳——原來那名四分衛正是他的寶貝兒子。
